Reduced switching-frequency modulation and circulating current suppression for modular multilevel converters
Tu, Qingrui and Xu, Zheng and Xu, Lie (2011) Reduced switching-frequency modulation and circulating current suppression for modular multilevel converters. IEEE Transactions on Power Delivery, 26 (3). pp. 2009-2017. ISSN 0885-8977 (https://doi.org/10.1109/TPWRD.2011.2115258)
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This paper describes a modified phase-shifted carrier-based pulsewidth-modulation (PSC-PWM) scheme for modular multilevel converters (MMC). In order to reduce the average device switching frequency, a reduced switching-frequency (RSF) voltage balancing algorithm is developed. This paper also proposes a circulating current suppressing controller (CCSC) to minimize the inner circulating current in an MMC. Based on the double line-frequency, negative-sequence rotational frame, the three-phase alternative circulating currents are decomposed into two dc components and are minimized by a pair of proportional integral controllers. Simulation results based on a detailed PSCAD/EMTDC model prove the effectiveness of the modified PSC-PWM method and the RSF voltage-balancing algorithm. The proposed CCSC not only eliminates the inner circulating current but also improves the quality of the converter ac output voltage. A simple loss evaluation demonstrates that the RSF voltage-balancing algorithm and the CCSC reduce the converter power losses.
ORCID iDs
Tu, Qingrui, Xu, Zheng and Xu, Lie ORCID: https://orcid.org/0000-0001-5633-7866;-
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Item type: Article ID code: 43387 Dates: DateEventJuly 2011PublishedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 02 Apr 2013 15:28 Last modified: 11 Nov 2024 10:22 URI: https://strathprints.strath.ac.uk/id/eprint/43387